Explosive-engine.



PATENTED SEPT. 18. 1906.

H. DOCK.

EXPLOSIVE ENGINE.

APPLICATION FILED NOV. 5,.1903.

2 SHEETS-SHEET 1.

ocoOO 0 l/Vl/ENTUR M M A TTORNE n9 No. 831,044. PATENTED SEPT. 18, 1906.DOCK. EXPLOSIVB ENGINE.

APPLICATION FILED NOV. 6 1903.

2 SHEETSSHEET 2 HERMAN DOCK, OF PHILADELZPHIA, PENNSYLVANIA.

EXPLOSIVE-ENGINE- Specification of Letters Patent.

Patented Sept; 18, 1906.

Application filed November 6, 1903. serial No. 180,005.

To on whom, it may concern:

Beit known that I, HERMAN DooK, a citizen of the United States, residingat Philadelphia, county of Philadelphia, and State of provements in theconstruction and mode of operation of explosive-engines, whereby theinitial starting of the engine may be accomplished better and with morecertainty.

In my improved engine, which forms the subject-matter of this invention,I initially connect the carbureter with air under pressure. There isthus admitted to the cylinder gas under pressure, so that the piston isforced forward on its first stroke by the normal expansion of the gas,and on the return stroke ofthe piston the exhaust-valve is operated by asupplemental cam to release a part of the compressed mixture, theremainder being recompressed by the return move: I

ment of the piston and fired when the piston is at or about thebeginning of the next forward stroke. By this construction I start myengine automatically by the normal expansion of the gas and continue thestarting impulse by the expansion of the gas due to ignition. After theengine has been started in this manner connection between the carbureter and the source of air under pressure is cut off and connectionis made between air at atmospheric pressure and the carbureter, so thatthe engine continues to operate in the ordinary manner.

In-the accompanying drawings I have shown an apparatus by which myimproved method may becarried out.

Figure 1 shows an illustrative view, partially in section, of myinvention. Fig. 2 is a top plan view, partially in section.

In the drawings, A is the source of pres sure-supply, in this case,shownas a pressuretank.

,the' gas or vapor and air are admixed to form an explosive mixture.

. G is a pipe leading from the carbureter B so-called carbureter{ of anexplosive-enginethat is, a chamber in which' able inlet-valve therein.

Eis a pipe leading from the source of-pressure-supply A, and F is a pipeleading from the atmosphere. These pipes E and h come together at thevalve G, from which valve a pipe H leads to the'carburetcr. By turningthis valve connection may be made either from the pipe E (from thepressure-supply) to the carbureter B or from the pipe I! (atmosphere) tothe carbureter.

'I is the piston; J, the connecting-rod; K, the cranks L, thecrankshaft; M M, the exhaust-carn gears; N, the exhaust-cam; O, a

ates the exhaust-valve back strokes of the piston alternate to that ofthe cam N.

In carrying out my invention, in the initial shown in the drawings, toconnect the pipe E with the carbureter, admitting gas under pressure tothe cylinder, forcing the piston ahead on one forward stroke by normalexthe piston has moved forward under .this

ressure, the relief-cam O operates the exaust-valve R, relieving some ofthe pressure. On the return stroke of the piston the remainder of theinitial charge is recompressed and fired in the ordinary manner. Afterthe engine has been started and attains 'sufiicient momentum the suplemental cam I is moved out of action, t e valve G is turned so as toconnect the pipe F with the carbureter B, under which conditions 'theengine will continue its operation by'drawingin a charge underatmospheric pressure and will operate in the usual way.

what I, claim, and desire to protect by Letters Patent, is

1. In an explosive-engine, in combination, a cylinder, a carbureter,connection between .the carburetor and the cylinder, 8. source of a tothe cylinder D of the engine, havinga suitset that when in operativeposition it oper-' Having now fully described my invention,

supplemental or relief cam movable in and starting of the engine thevalve is turned, as

pension of the compressed charge. When to connect the carbureter witheither the airpressure pipe or the pipe to the atmosphere.

3. In combination, a cylinder, a carbureter, connection between thecarbureter and the cylinder, a source of air-pressure supply, and meansto connect the carbureter with either the air-pressure supply or theatmosphere.

4. In an engine of the character described,

a cylinder, a piston therein, means for supplying a charge of explosivemixture under pressure to said cylinder to drive the piston on a forwardstroke by normal expansion, an exhaust adapted to relieve a portion ofsaid charge near the end of said stroke, said piston on its returnrecompressing the balance of said charge, means to ignite suchrecompressed charge at such point as to drive the piston ahead on itsnext forward stroke by expansion due to ignition.

5. In an engine of the character described, a cylinder, apiston therein,means'for supplying a charge of explosive mixture under pressure to saidcylinder to drive the piston on the forward stroke by normal expansion,an exhaust adapted to relieve a portion of said charge near the end ofsaid stroke, said piston on its return rccompressing the balance of saidcharge, means to ignite such recompressed charge at such point astodrive the piston ahead on its next forward stroke by expansion due toignition, and means for cutting off the supply of compressed mixture andsupplying an explosive mixture under atmospheric pressure.

In testimony of which invention I have hereunto set my hand, atPhiladelphia, on this 28th day of October, 1903.

' HERMAN DOCK.

,Witnesses:

M. F. ELLIS, M. M. HAMILTON.

